civicrm DB error when >20 membership types are created

DB Error: unknown error

Error Details
Database Error Code: Data too long for column 'membership_types' at row 1, 1406
Additional Details:
Array
(
    [callback] => Array
        (
            [0] => CRM_Core_Error
            [1] => handle
        )

    [code] => -1
    [message] => DB Error: unknown error
    [mode] => 16
    [debug_info] => UPDATE  civicrm_membership_block  SET membership_types = 'a:20:{i:1;s:1:\"0\";i:2;s:1:\"0\";i:4;s:1:\"2\";i:5;s:1:\"2\";i:6;s:1:\"2\";i:7;s:1:\"2\";i:8;s:1:\"2\";i:9;s:1:\"2\";i:10;s:1:\"2\";i:11;s:1:\"2\";i:12;s:1:\"2\";i:13;s:1:\"2\";i:14;s:1:\"2\";i:15;s:1:\"2\";i:16;s:1:\"2\";i:17;s:1:\"2\";i:18;s:1:\"2\";i:19;s:1:\"2\";i:25;s:1:\"2\";i:26;s:1:\"2\";}'   WHERE (  civicrm_membership_block.id = 4 )   [nativecode=1406 ** Data too long for column 'membership_types' at row 1]
    [type] => DB_Error
    [user_info] => UPDATE  civicrm_membership_block  SET membership_types = 'a:20:{i:1;s:1:\"0\";i:2;s:1:\"0\";i:4;s:1:\"2\";i:5;s:1:\"2\";i:6;s:1:\"2\";i:7;s:1:\"2\";i:8;s:1:\"2\";i:9;s:1:\"2\";i:10;s:1:\"2\";i:11;s:1:\"2\";i:12;s:1:\"2\";i:13;s:1:\"2\";i:14;s:1:\"2\";i:15;s:1:\"2\";i:16;s:1:\"2\";i:17;s:1:\"2\";i:18;s:1:\"2\";i:19;s:1:\"2\";i:25;s:1:\"2\";i:26;s:1:\"2\";}'   WHERE (  civicrm_membership_block.id = 4 )   [nativecode=1406 ** Data too long for column 'membership_types' at row 1]
    [to_string] => [db_error: message="DB Error: unknown error" code=-1 mode=callback callback=CRM_Core_Error::handle prefix="" info="UPDATE  civicrm_membership_block  SET membership_types = 'a:20:{i:1;s:1:\"0\";i:2;s:1:\"0\";i:4;s:1:\"2\";i:5;s:1:\"2\";i:6;s:1:\"2\";i:7;s:1:\"2\";i:8;s:1:\"2\";i:9;s:1:\"2\";i:10;s:1:\"2\";i:11;s:1:\"2\";i:12;s:1:\"2\";i:13;s:1:\"2\";i:14;s:1:\"2\";i:15;s:1:\"2\";i:16;s:1:\"2\";i:17;s:1:\"2\";i:18;s:1:\"2\";i:19;s:1:\"2\";i:25;s:1:\"2\";i:26;s:1:\"2\";}'   WHERE (  civicrm_membership_block.id = 4 )   [nativecode=1406 ** Data too long for column 'membership_types' at row 1]"]
)